ML13150 Просмотр технического описания (PDF) - LANSDALE Semiconductor Inc.
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ML13150 Datasheet PDF : 20 Pages
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ML13150
LANSDALE Semiconductor, Inc.
IF AMPLIFIER
The first IF amplifier section is composed of three differential
stages. This section has internal dc feedback and external
input decoupling for improved symmetry and stability. The
total gain of the IF amplifier block is approximately 42 dB at
455 kHz. Figure 8 shows the gain of the IF amplifier as a
function of the IF frequency.
The fixed internal input impedance is 1.5 kΩ; it is designed
for applications where a 455 kHz ceramic filter is used and
no external output matching is necessary since the filter
requires a 1.5 kΩ source and load impedance.
Overall RSSI linearity is dependent on having total midband
attenuation of 10 dB (4.0 insertion loss plus 6.0 dB
impedance matching loss) for the filter. The output of the IF
amplifier is buffered and the impedance if 1.5kΩ.
LIMITER
The limiter section is similar to the IF amplifier section
except that six stages are used. The fixed internal input
impedance is 1.5 kΩ. The total gain of the limiting
amplifier sections is approximately 96 dB. This IF limiting
amplifier section internally drives the quadrature detector
section.
Figure 8. IF Amplifier Gain
versus IF Frequency
50
45
40
35
Vin = 100 µV
30 Rin = 50 Ω
Rout = 1.4 kΩ
25 BW (3.0 dB) = 2.4 MHz
TA = 25°C
20
0.01
0.1
1.0
10
f, FREQUENCY (MHz)
Figure 9. Fadj Current
versus IF Frequency
120
100
VCC = 3.0 Vdc
Slope at 455 kHz = 9.26 kHz/µA
80
60
40
20
0
0
200
400
600
800
1000
f, IF FREQUENCY (kHz)
800
750
700
650
600
0
Figure 10. Fadj Voltage
versus Fadj Current
VCC = 3.0 Vdc
TA = 25°C
20
40
60
80
100
Fadj CURRENT (µA)
Figure 11. BWadj Current
versus IF Frequency
3.5
3.0
VCC = 3.0 Vdc
BW 26 kHz/µA
2.5
2.0
1.5
1.0
0.5
0
400
420
440
460
480
500
f, IF FREQUENCY (kHz)
Page 6 of 20
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